Electrical: Breakers, Conduit, Wiring Guides & Supplies
This hub collects PES Supply's electrical trade content in one place — the reference guides contractors keep bookmarked and the calculators that check the math in the field. Breaker sizing with the NEC 125% continuous-load rule, conduit installation from EMT to PVC, 240V outlet wiring, and the amps-to-watts and kVA-to-kW conversions that come up on every panel schedule. These are not generic explainers: each guide carries the pairing tables, worked examples, and code references a journeyman would check — wire gauge to max breaker, conduit fill limits, and conversion tables from 12V DC to 240V AC. Our brand guides cover the distribution and protection lines we stock, including Eaton and Schneider Electric, and the shop links jump straight to wire, conduit, boxes, and supplies at wholesale pricing. Because we supply solar, generator, and EV installs as well, these guides are written with those interconnects in mind — the 120% solar backfeed rule, generator transfer circuits, and EV continuous loads all show up in the math. Start with the breaker guide; it is the most-referenced article on the site.
Start here
How to Size a Circuit Breaker: NEC Rules + Wire Gauge Pairing →
The site's most-referenced electrical guide — the NEC 125% rule, the standard breaker ladder, and wire-gauge pairing tables from 14 AWG to 2 AWG. It covers continuous loads, solar backfeed under the 120% rule, and the worked examples contractors reference on jobsites.
Wiring & Install Guides
Field references — conduit, outlets, and the unit conversions used on every job.
- How to Size a Circuit Breaker — NEC 125% rule, standard sizes, and breaker-to-wire pairing tables.
- How to Install Electrical Conduit — EMT, PVC, and rigid — bending, strapping, fill limits, and pull boxes.
- How to Wire a 240V Outlet — NEMA configurations, breaker selection, and wire gauge for 240V circuits.
- How to Convert Amps to Watts — Master conversion tables at 12/24/48V DC and 120/240V AC with worked examples.
- kVA to kW Conversion Guide — Power-factor math for generators, transformers, and UPS spec sheets.
Tools
Free calculators — breaker size, wire gauge, and unit conversions in the field, with the NEC rules baked in so the output is an answer, not a homework assignment.
- Breaker Sizing Calculator — NEC 125% Rule — Continuous-load sizing with standard breaker sizes, wire gauge, and a solar backfeed 120% check.
- Amps to Watts Calculator — Instant conversion at any common voltage, single and three-phase.
Brand Guides
Distribution, protection, and power-management lines we stock — dealer-level specs and product-line maps.
- Eaton Brand Guide — Load centers, breakers, and surge protection — the distribution standard for residential and commercial panels.
- Schneider Electric Brand Guide — Conext XW Pro, MPPT controllers, and energy-management hardware for solar and backup power systems.
Shop Electrical Supplies
Wire, conduit, boxes, and protection hardware at wholesale pricing with freight nationwide — the same inventory our guides reference, shipped to the jobsite.
- Electrical Supplies — All — The full electrical catalog.
- Electrical Boxes & Covers — Device boxes, junction boxes, and covers.
- Allied Tube & Conduit — EMT, rigid, and conduit fittings.
- Cerro Wire — Building wire by the foot and spool.
- Cobra Wire & Cable — Flexible cable for marine, solar, and battery.
- PV Wire — USE-2 and PV wire for solar arrays.
- Schneider Electric — Conext and Square-D adjacent inventory.
Why contractors source from PES Supply. We are a wholesale supplier, not a content farm — every guide on this page exists because we sell and support the equipment it covers. That means real model numbers, real warranty terms, and honest limitations instead of affiliate-listicle rankings. Order through any collection link and you get contractor pricing, consolidated freight on multi-pallet orders, and a support line staffed by people who can read a spec sheet.
Get a wholesale quote. Stocking up for a panel upgrade, rewire, or solar interconnect? Send us the full material list — we'll quote wire, conduit, breakers, and protection hardware with contractor pricing and freight arranged to the jobsite. Request a quote →
Portlandia Electric Supply stocks generators, solar, battery storage, EV charging, and electrical supplies at wholesale — browse all collections or explore our other hubs: Generators · Solar · Battery Storage · EV Charging · Electrical.